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    <p>The reason that <code>width</code> does not appear to be 'sticky' is that certain operations are guaranteed to call <code>.width(0)</code> on an output stream. Those are:</p> <p>21.3.7.9 [lib.string.io]:</p> <pre><code>template&lt;class charT, class traits, class Allocator&gt; basic_ostream&lt;charT, traits&gt;&amp; operator&lt;&lt;(basic_ostream&lt;charT, traits&gt;&amp; os, const basic_string&lt;charT,traits,Allocator&gt;&amp; str); </code></pre> <p>22.2.2.2.2 [lib.facet.num.put.virtuals]: All <code>do_put</code> overloads for the <code>num_put</code> template. These are used by overloads of <code>operator&lt;&lt;</code> taking a <code>basic_ostream</code> and a built in numeric type.</p> <p>22.2.6.2.2 [lib.locale.money.put.virtuals]: All <code>do_put</code> overloads for the <code>money_put</code> template.</p> <p>27.6.2.5.4 [lib.ostream.inserters.character]: Overloads of <code>operator&lt;&lt;</code> taking a <code>basic_ostream</code> and one of the char type of the basic_ostream instantiation or <code>char</code>, signed <code>char</code> or <code>unsigned char</code> or pointers to arrays of these char types.</p> <p>To be honest I'm not sure of the rationale for this, but no other states of an <code>ostream</code> should be reset by formatted output functions. Of course, things like <code>badbit</code> and <code>failbit</code> may be set if there is a failure in the output operation, but that should be expected.</p> <p>The only reason that I can think of for resetting the width is that it might be surprising if, when trying to output some delimited fields, your delimiters were padded.</p> <p>E.g.</p> <pre><code>std::cout &lt;&lt; std::setw(6) &lt;&lt; 4.5 &lt;&lt; '|' &lt;&lt; 3.6 &lt;&lt; '\n'; " 4.5 | 3.6 \n" </code></pre> <p>To 'correct' this would take:</p> <pre><code>std::cout &lt;&lt; std::setw(6) &lt;&lt; 4.5 &lt;&lt; std::setw(0) &lt;&lt; '|' &lt;&lt; std::setw(6) &lt;&lt; 3.6 &lt;&lt; std::setw(0) &lt;&lt; '\n'; </code></pre> <p>whereas with a resetting width, the desired output can be generated with the shorter:</p> <pre><code>std::cout &lt;&lt; std::setw(6) &lt;&lt; 4.5 &lt;&lt; '|' &lt;&lt; std::setw(6) &lt;&lt; 3.6 &lt;&lt; '\n'; </code></pre>
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    1. POWhich iomanip manipulators are 'sticky'?
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